Abstract
The brightness temperature of polymethyl methacrylate subjected to a shock wave reflected from a transparent LiF or sapphire window was measured by a pyrometric method. The pressure range in the primary wave was 20–40 GPa, and that in the reflected wave was 30–78 GPa. At an intensity of the primary shock wave in the range of low pressures (19.2–20.8 GPa), the temperature values in the reflected wave lie on a single-shock Hugoniot curve within the experimental error, as opposed to what might be expected based on the gas-dynamic calculation for the case of double shock loading. As the primary shock pressure increases to 38–41 GPa, the reflected shock temperature values [(2.4–2.6)\(\,\cdot\,\)103 K] become lower than on the single-shock Hugoniot (3.1 \(\,\cdot\,\) 103 K) but remain larger than those calculated by the equation of state (2.3\(\,\cdot\,\)103 K) under the assumption that the composition of polymethyl methacrylate is inert. It is concluded that this behavior of the temperature dependence is due to the depolymerization and subsequent decomposition of polymethyl methacrylate.
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Translated from Fizika Goreniya i Vzryva, 2021, Vol. 57, No. 6, pp. 112-121.https://doi.org/10.15372/FGV20210613.
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Bordzilovskii, S.A., Voronin, M.S. & Karakhanov, S.M. Temperature of Polymethyl Methacrylate in a Secondary Shock Wave. Combust Explos Shock Waves 57, 736–745 (2021). https://doi.org/10.1134/S0010508221060137
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DOI: https://doi.org/10.1134/S0010508221060137